Question

A polyatomic ion contains 18 protons and 20 electrons. the net charge if this ion is ___?

Answer 1

Net Charge = -2

Explanation:

If we subtract 18 from 20 we get 2. Since protons are positive and electrons are negative, and then it's obvious that electrons are greater in number, therefore the net charge would also be negative which is -2.

hope that helps...

Answer 2

-2 cuz 20 negative minus 18 positive is -2